Piston packing



Oct. 25, 1927. 1,646,978

J. F. PANYARD PISTON PACKING Filed Oct. 19. 1925 www* @il 7 22g d, ATTORNEY.

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narran sr PISTON PACKING.

reputation inea Yoctober ie, 1925. serial no. sassi.

irly invention relates to improvements in pf ton packing' and particularly to that type o'l" paci-:ingr in which a packing ring having a helical axial face is rotatably disposed Within the lgroove in the piston whereby upon rotation in a given direction the packing wedged against the side Walls of the lgroove.

rlhe object ot iny invention is to provide 'in packingY ot the character described in'ipro'ved means adapted to hold the paclnngagainst rotation in a given direction ivhile permit; ting rotation in theV opposite direction, and a. nieritorious 'feature consists in the provision ol" a device adapted to automatically retain the packing against rotation tending to dio'iinish its axial di i'iiension while pernnttine' rotation tending' to increase the axial iliinension.

An adi'antag'eons object consists in the einployine'it in conjunction with a pair of cooperating' ring' sections having' helical meetino trices ot niechanisnii engaging the ring sections and holding` thein at di'lierent adjusted positions against relative rotation in a. given direction, and a convenient 'torni' ot means suitable tor the purpose is a spring device tensioned to engage the packing; rings di ,erent positions or" relative rotation to prevent rotation which would diminish the conibined axial dimension oit the rings.

li e above objects and advantages together with other meritorious Jfeatures Will inore 'hilly appear :troni the following` specilication, appended claims and accompanying drawings in which:

llia'urel a cross-sectional view through a piston showing' niy improved packingl in position in the packing groove:

i 2 is a cross-sectional view talten on line 42 2, l.

Fin'. 3 'is a cross-sectional view taken on line Fig. 1.

Fig'. t is a. side elevation ot packing rings embodying' niy invention.

5 is a perspective of one of the paolinn' rings illustrated in Fig. si.

6 is a perspective of the other packing' ring; illustrated in Fig. 4.

Fing. 7 is a. perspective ot' a spring` locking member associated with the packing rings.

In the embodiment of iny invention illustrated herewith let 10 indicate a piston pro-- vided with a suitable packing groove .12, and in Figs. 2 and 3 a broken away portion of the cylinder Wall is indicated as 14. My

improved packing is .mounted in the piston groove here illustrated it consists ot a pair ot ring' sections 16 and 18 which have helical meeting' `laces whereby upon tation of one ring` section counter' the other toe combined axial din'iension ot the packing increased.

)is here illustrated lA have preferred to provide ring section with a base flange fit) which is cnt away for a portion ot the cii'cuinlerence or the ring' as shown at 22 expose the serrated edgcije ot the inner Auinterenee ot ring section 16.

' to the base flange Q0 to overhano' the recess fornied by cutting' out a portion oi.' A. 'flange a spring inoniber QG which is here .shown as being-:3 arcuate in torni and hav;4 s convex 'lace abutting' the bottoni oi the groove in the piston. rlhis spring member n ay he toi-ined shown in Fig. 7, having a width substantially equal to the Width of the groove to cut out at 28 to providea portion to extend alongside the ring section 15j to engfgage the serrations 211 o'i' 1 tion 1G to prevent rotation in al given directi n oil such ring section 1G relative to the ring; section 1S. is appears in Fig. 1, this serine; tl is constrained between the bottoni ot the groove and the packingso that the engaging; end thereof always held against the serrations which notches are eut as shown in Figs. 1 and in such av Inanner as to permit rotation ot the ring' 1neinbei' 1G as illustrated in 1 in a countereloclmvise direction While preventing reto.. n rotation ot this ring section.

ln operation niy packing' is installed in the provided groove in the piston and the ring; sections are rotated by grippingv their peripheries so as to lill 'the groove and the spring' 2G holds thein at that position oi adjusted relative rotation to which they have been brought. lt is possible therefore? to employ this packing very satislactoril.;1 is a replace-nient packing"v installingl the saine in grooves which vary and run overwvidth, and by adjusting` the packinga'l'ter it is in the groove it may be brought to the required axial dimension to prevent leakage of coinpression along' the side Walls of the `groove.

In addition to the provision or axial er;- pansion by rotation ot' one ring, section counter the other, it is to be noted that the helical meeting 'faces are beveled so that, as ring1 section 18 Wears more rapidly than ring section 16, once ring section 16 is brought into engageinent with the cylinder'wall a wedging kaction will :be exerted by ring section 16. This is Ain addition to the wedginglaction produced by the rotatable .movement TWhat l claim is:

l. ln piston packing, apiston having a groove for packing, packing` in said groove comprising a. pair ot ring sections having helical meeting faces whereby upon rotation of one section counter the helical meeting 'taceoi the other the packing is wedged axially against the side walls of the groove in the piston, and locking means adapted to automatically hold one ot .said sections at ditle'rent positions of rotation relative to the other. i

2. ln piston packing, a piston having a groove for packing, packing in'said groove comprising a pair ot ring sections having helical meeting tacos whereby upon rotation ot one section counter theV helical meeting tace ot the other the packing is wedged aXi ally7 against the Side walls ot the groove in the piston, and means adapted to lock said lsections against relative rotation in one direction while permitting relative rotation in the opposite direction.

8. ln piston packing, a piston having a groove tor packing, packing in said groove comprising a pair ot' ring sections having helical meeting faces whereby upon rotation ot one section counter the helical meeting tace of the other the packing is wedged axially againstrthe side walls of the groovein the piston, and spring means engaging said sections to automatically lock them against relative rotation in one direction.

el. ln piston packing, a. piston having a groove tor packing, packing in said groove comprising a pair of ring sections having helical meeting 'faces whereby upon rot-ation of one section counter the helical meeting tace oi the other the packing is wedged aliially against the side wallsot the groove in the piston, and spi-ing means positioned in the bottom of the groove in the piston adapted to automatically lock said sections against relative rotation to diminish the combined axial dimension while permitting relative ro tat-ion to increase the combined axial di mension.

5. ln piston packing, a piston having a groove tor packing, packing in said groove comprising a pair of ring sections having nazisme helical meeting faces whereby upon rotation ot one section counter the helical meeting 4face o ii the other the packing' is wedged axially against the side walls of the groove in `the piston, and spring means engaging said rings to hold them against relative rotation to diminish the combined axialdimension of .in the piston, `and locking means carried by one ring section engaging the other ring section tohold said sections against relative rotation inone direction while peiinittii'ig relative rotation in the opposite direction.

7. ln piston pac-king, a. piston having a groovetor packing, packing in said groove comprising a pair oi' ring sections having helical meeting faces whereby upon rotation ot one section counter the helical meeting iace of the other the packing is wedged axially against the side walls of the groove in the piston, a locking device carried by one ring-section, and' locking recesses formed on the other ring section, said locking device engaged in 'said recesses to automatically hold said sections against relative rotation in one direction. y

8. ln piston packing, a piston having a groove tor packing,a ring section rotatably mounted in said groove havinga. helical axial tace7 said groove provided with an opposed axial helical tace. and means engaging said ring section to hold it against rotation in the groove in one direction while `permitting rotation inthe opposite direction.

9. In piston packing, a piston having a groove for packing,a ring` section rotatably mounted in said groove having a helical axial tace, said groove provided with an opposed axial helical tace yand a spring device automatically operable to hold said ring at vadjusted positions of rotation against rotation in a given direction. l,

1n testimony whereof, I 'sign this specifiI cation.

JOHN F. PANYARD. 

